Manganese(II) Ion-Selective Membrane Electrode Based on N-(2-picolinamido ethyl)-Picolinamide as Neutral Carrier

• Published in: Bulletin of the Korean Chemical Society Vol. 31; no. 10; pp. 2980 - 2984
• Main Authors: Aghaie, M., Giahi, M., Zawari, M.
• Format: Journal Article
• Language: English
• Published: 대한화학회 20.10.2010
• Subjects: 화학
• ISSN: 0253-2964; 1229-5949
• DOI: 10.5012/bkcs.2010.31.10.2980

A new poly (vinyl chloride) (PVC) membrane electrode that is highly selective to Mn+2 ions was prepared using N,N'-bis(2'-pyridinecarboxamide)-1,2-ethane (bpenH2) as a suitable neutral carrier. This concentration range (1.0 × 10‒5 to 1.0 × 10‒1 M) with Nernstian slope of 29.3 ± 0.5 mV per decade. The detection limit and the response time of electrode were 8.0 × 10‒6 M and (≤ 15 s) respectively. The membrane can be used for more than two months without observing any divergence. The electrodes exhibited excellent selectivity for Mn+2 ion over other mono-, di- and trivalent cations. Selectivity coefficients were determined by the matched potential method (MPM). The electrode can be used in the pH range from 4.0 - 9.0. The isothermal coefficient of this electrode amounted to 0.00023 V/oC. The stability constant (log Ks) of the Mn+2 - bpenH2 complex was determined at 25 oC by potentiometric titration in mixed aqueous solution. The proposed electrode was applied to the determination of Mn+2 ions in real samples. KCI Citation Count: 7